What is the isolation distance for cotton seed production?
A minimum isolation distance of 50 metres for foundation seed class and 30 metres for certified seed class production, from fields of other varieties of the same species, other species and field of the same variety not conformity to varietal purity requirements for certification, is necessary.
What is isolation distance in seed technology?
The crop raised for seed production should be separated from other fields of the same crop species by a minimum distance, which varies from one crop to the other. This distance is known as isolation distance.
What is time isolation in seed production?
Temporal Isolation crop of seed production should be sown early or late by a margin of 15-20 days than neighboring fields of same or other variety to prevent entry of foreign pollens in the field of seed production.
Is the minimum safer distance by which we can isolate the seed production plot from other contaminants?
The minimum distance to be maintained between the seed crop and the contaminant is called Isolation distance.
Why isolation distance is maintained?
Isolation prevents unwanted cross-pollination and is the primary practice required to keep varieties true to type. Isolation by distance is the most reliable method, which involves providing enough distance between a variety and any sources of contaminating pollen to ensure that the variety remains true to type.
What is AB and R line?
B-line is isogenic line of A-line, only difference in male sterility and fertility. R-line possesses fertility restoration gene . In many cases, a nuclear-encoded fertility restorer gene (Rf) can restore fertility of the cytoplasmic male-sterile plants.
Why isolation distance is required?
Which of the following require highest isolation distance?
Crops Minimum Isolation Distance
|crops||Minimum Isolation Distance(M)|
How far can plants pollinate?
Research has shown that pollen can travel much further than 10 miles, but the amount of pollen transported decreases logarithmically with increasing distance from the source. Therefore, the risk of pollination should be negligible beyond ten miles from a pollen source.
What is CMS line?
In this case, male sterility is maternally transmitted and all progeny will be male sterile. These CMS lines must be maintained by repeated crossing to a sister line (known as the maintainer line) that is genetically identical except that it possesses normal cytoplasm and is therefore male-fertile.
Which tag used in certified seed?
Thus, they are also called as Labelled Seed. The Breeder seeds have golden yellow tag, Foundation seeds have white tag, registered seeds have opal blue tag and certified seeds have green tag.
What are isolated seeds?
Isolated Seeds: These seeds have been harvest from peppers that were isolated from insects using fabric bags over the branches before the blossom opened. This is not a 100% guarantee, but from our own grow outs of isolated seeds we have not seen any crosses yet.
How much misolation is required for hybrid seed production in cotton?
The cotton hybrid seed production plot should have 30 misolation distance on all sides from other fields. The isolation distance between parents should be minimum 5 m as shown below. The other field standards tobe met for certification given in table 3. Technical Bulletin from CICR (www.cicr.org.in) 6 Hybrid seed production in cotton
What is the minimum distance required for isolation of contaminated cotton?
19 Minimum isolation shall be at least 100 feet (30.48m) if the cotton plants in the contaminating source differ by easily observable morphological characteristics from the field to be inspected.
Is isolation required for the production of hand pollinated seed?
10 No isolation is required for the production of hand-pollinated seed. 11 When the contaminant is the same color and texture, the isolation distance may be modified by (1) adequate natural barriers or (2) differential maturity dates, provided there are no receptive silks in the seed parent at the time the contaminant is shedding pollen.
What is the distance required for certified seed production?
3 Isolation distance for certified seed production shall be at least 500 feet (152.07m) from varieties of dissimilar adaptation. 4 Isolation between classes of the same variety may be reduced to 25 percent of the distance otherwise required. 5 This distance applies when fields are 5 acres (2ha) or larger in area.